I’d welcome info and restoration suggestions for my Dad’s prized Viking bike—ca 1935? He was ten when he got it, and he rode it all over the county, logging several thousand miles on the odometer. He loved this bike: it is complete and untouched, but the decades stored in the barn haven’t been kind to it. I’d like to clean it up, but want to keep it as close as possible to original condition. Would be grateful for any helpful advice.